My needs ( wants) have changed dramatically in the last few years. This only applies to LIONEL products but I do buy MTH and GGD engines but less so.
Before I spend $800- $2500 on a steamer it must have my most desired features in a Legacy/Odessey/Vision Steam Engine
1. Bluetooth control
2. Whistle steam ( so cool!)
3. IR control
4. swinging bell (few engines do but they all should)
5. wireless tether
6. nice lighting with tender backup lights
7. great detailing of small details; piping must be applied not cast.
8. detailed cab interior (glowing firebox)
9. controls hidden up-top
10. great sound which for Lionel goes without saying.